Cut off the top of the head of garlic, drizzle with olive oil, salt and wrap tightly in aluminum foil. Roast in the oven at 350 for 1 hour, or until the garlic is soft. Remove and allow it to cool down. Optionally, use 1 tbsp fresh minced garlic.
Next, dice a yellow onion, sauté until it is translucent and allow it to cool down.
In a separate cup, combine the breadcrumbs with milk, mix it well and let it sit for 5 minutes. The breadcrumbs will start to absorb the milk and will turn into a milky paste.
In a large mixing bowl, add the ground beef, garlic, sautéed onions, whisked eggs, breadcrumb paste, parsley, Worcestershire, seasoning and horseradish mustard.
Mix the ingredients by hand enough to have everything evenly mixed. Do not over mix it.
Transfer the meatloaf mix to sheet pan lined with butcher paper. Shape it into an oval and make sure all cracks and edges are sealed.
Season the outside of the meatloaf with Dad's all purpose rub.
Preheat the grill to 250 degrees and set for indirect heat. Place the sheet pan with the formed meatloaf on the grill and let it smoke.
For the glaze, add all the ingredients to a saucepan, mix and simmer over low heat for 5 minutes.
After an hour, brush the glaze all over the meatloaf. Close the lid and repeat this process every 30 minutes.
When the internal temperature of the meatloaf reaches 160 degrees it's time to remove it from the grill.
Rest for 5-10 minutes and serve. Enjoy!
Notes
If you don't want to roast the garlic, you can substitiue with fresh, minced garlic.
Create a flavor profile you enjoy most. For a BBQ meatloaf, add some brown sugar and bbq sauce into the mix. For a spicy meatloaf, finely dice up a jalapeno and use hot sauce in the mixture. Make it your own and don't be afraid of flavor!
Do not cook the meatloaf on a wire rack. The meat will sink into the wires while it smokes making it difficult to remove once done.
If you plan on using a regular grill or oven follow the same time and temps.